Ultrastructure of Sperm in Wild Yak

The ultrastructure in sperm of wild yak can be used to examined and assess truly and all round the function and fertilization ability of the sperms. The ultrastructure in the sperm of wild yak was investigated under different states, such as fresh semen, frozen semen and capacitation sperm, and its characteristics were described by electron microscope. The sperm consisted of the head, neck and tail, the length was 78.34±7.24 μm. After capacitation, the acrosome in sperm swelled and vesiculated, there were obvious vesiculation in the acrosome. The evagination on the ectoblast of acrosome formed the large vesiculation and inner membrane swelled. The evagination on the ectoblast of acrosome folded and formed catenular vesiculation. The plasma membrane on the tail swelled. The head, neck and tail of the abnormal sperm were abnormal.